On Thu 02-03-17 12:17:47, Anshuman Khandual wrote: > On 03/02/2017 10:49 AM, Xiong Zhou wrote: > > On Wed, Mar 01, 2017 at 04:37:31PM -0800, Christoph Hellwig wrote: > >> On Wed, Mar 01, 2017 at 12:46:34PM +0800, Xiong Zhou wrote: > >>> Hi, > >>> > >>> It's reproduciable, not everytime though. Ext4 works fine. > >> On ext4 fsstress won't run bulkstat because it doesn't exist. Either > >> way this smells like a MM issue to me as there were not XFS changes > >> in that area recently. > > Yap. > > > > First bad commit: > > > > commit 5d17a73a2ebeb8d1c6924b91e53ab2650fe86ffb > > Author: Michal Hocko <mhocko@xxxxxxxx> > > Date: Fri Feb 24 14:58:53 2017 -0800 > > > > vmalloc: back off when the current task is killed > > > > Reverting this commit on top of > > e5d56ef Merge tag 'watchdog-for-linus-v4.11' > > survives the tests. > > Does fsstress test or the system hang ? I am not familiar with this > code but If it's the test which is getting hung and its hitting this > new check introduced by the above commit that means the requester is > currently being killed by OOM killer for some other memory allocation > request. Well, not exactly. It is sufficient for it to be _killed_ by SIGKILL. And for that it just needs to do a group_exit when one thread was still in the kernel (see zap_process). While I can change this check to actually do the oom specific check I believe a more generic fatal_signal_pending is the right thing to do here. I am still not sure what is the actual problem here, though. Could you be more specific please? -- Michal Hocko SUSE Labs
